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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65f20749ffe32e4954dab3ab5657fe345f5df7b1126a7813923204b454360aa4' 
  AND token = 'Q59dkcgmHk6SKezCJ/3ZEjzP4YAH/U/MKUema9L2G2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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