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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2dd83080661657a8d77b567ad004d3811bcd1285a91b092bfc71398ea7b37eb' 
  AND token = 'c3Pd3Y7nu00lKUz7Cy9g+kIBEaiY91tkTrbuGQO9KQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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