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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8474aa2974293a44e61d572f825ba21b0375ff1aee368b3e8f72fa5bf82184ef' 
  AND token = 'd97Fyhnd5wGECqXrlpK4xFRzEy3i7CzoZiTwaCeGJvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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