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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f69b73d6bca1f41215cc35174ea86188663a36c94422b2089f618e2e46a734ca' 
  AND token = 'AcgaVj5W1V1rvrUnTFiKVJii4OHG9iQeILNl7UTVuRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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