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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '356e42560dec56e32177a7829ddb8f36ab1bf13226cf768faae0459d5e1205b0' 
  AND token = '2K2aIqwM+igV3n2vdbuOPSQ7yiff+FXF+aNlP3k1eco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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