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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b1ee92fabc04253cb855c28d12d7bd39afd5261c58deea36caeeed590185b43' 
  AND token = '3ljq855TnO+o8grHz4vlLsabtgyTZLxfNQ7ak1Sctk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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