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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a4461cd9bd9f5e4270b27fd1d7c03cd0778b0b3d53e4c08dedee74cc5ded456' 
  AND token = 'RbFTh6lDpcV+qx9FIF1a6OlA+3xopIWkwYDvwOrukkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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