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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfd13c54665fa2b126d14f7712d5b1be8b2144a8cea8c409503366184bfceff4' 
  AND token = 'H1oP4CWJ42TtgO4DLCH18GKXIa/L2HZN9YDyQbAbuJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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