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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42d4ee232075f73bffb2a2772b44e555949cef7270fb234b06871213eff8b5f9' 
  AND token = 'u7U0W/xtcX2LdiIXSOKtRicX5eRy06uiT6AhpjCwWQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}