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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33be6e5b1b8930b9210355cba20f268635b17d5f065ac6129f2da4496527b1f3' 
  AND token = 'YJyeYokiYZKIaDtG2FrXf02Wqo7JJ2esnzvQEr1lf24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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