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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e9a44f0558694fffb7c629fda2ee724c64013d6b1ea1e7f20ba2f821e9fa1e0' 
  AND token = 'yOnhovTUpcystN/63lbWv98MzrLF9zHspnrAa1Ct4rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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