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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6db7a5f5be16cd1f4484888cb4ce1712e68563b4beb11b3bba268dd2fe74674e' 
  AND token = 'h3uMWo6KooiS/97c2kBQGSuEE74SHtb68PQpfyPnegk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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