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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02a3c0ea06f571ef9cad30bef4e95b29a0e22818754f282219be5142f32e89f5' 
  AND token = '0f66SmMyvJqqagzuI8Oj/1XfPSmB9fbQy1caQXNjpHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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