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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '037d6e29347ec2a582203b270627cba70c3af38b36fd2045fb114820afbb2ebc' 
  AND token = 'zgBDC6brs5s0w5g93OUet36s8dVWKtnB7/OtLAoViC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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