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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2c8c44b6fa9e6fd1e8112be77d0b4d33bbd067a141f02a176472025f60784ec' 
  AND token = 'hWKuG4Y6iViJO4E9RTUzlvW7HnteA6Qcvs+dqo3UyiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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