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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2f8ed82e7cfe348e2a30e7e386ed1d8af11e2a3c7f7cc2d41856201a4283d87' 
  AND token = 'Z4JeQJNzVZSenEUe8dE6Af0hBR1MDSIhrqeaorm6GO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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