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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c24b43a8a5aa7ba8615ce8de204d6f3ebb1f81c7ce0c08d62d0615168558cb3' 
  AND token = 'KN7+Nm8Y2hSser2oNBmUzRfvNcRgmrhm7Arppmw9CSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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