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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfb9e390bc07285ed9720fae7005e4a4d59bb909b60290e8c91240d9c376d1e0' 
  AND token = '9x2xuT9jLB79akhhArQldFb8qkM/WrBBZwfxMTlQ4Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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