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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cded6473163a76898c58a5177249614c2f46d70dff3bf5b9e5e5af261ed143e3' 
  AND token = 'NVS9E16cQlVMlL8Blle+xDJRvd0dlBFDRrjLNUtyUZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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