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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38b191a25ac21765cbece6d605e6344b2eeed358515a16feff39e0460ce26038' 
  AND token = 'n5KuFHq4v+kPXK0cg7RXU53j8QW6IVSCiZDfx98HEWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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