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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6038591979f1eab8e44182a1b2110a2cee392edc0f76ee52aab62c9acb7a5d8' 
  AND token = '2p0AzcEYSM5+8ofTlCCqhba6ikyt7Lu8dV/dXwyw3TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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