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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6eec1b377862a474a5379083b76bb6b4d1e1ad3b114f1bb1ba8bc38cc1ce0e7' 
  AND token = 'lN4lBTvGxasgbogY3460pvJKt139ApolpRG2B8yC6f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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