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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc0ea20bc14f37b00658efa5f355b5db42e647c3a8f7fc20b0ff7518d4d979dc' 
  AND token = 'LoQZR7dITTFVHeSprvJWTAtMdxiPxDv1w4o/zsokeSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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