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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '509dc217107a5a3314706e2c973755dac13e517b50358570358ef465d6827e97' 
  AND token = 'xrA0xeq5URK6KbJDNVHbL2Vi7yEPWlkesMzaXu4uJQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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