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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd9261678bc68242ceefc79ba721ccffa5dd90907439ab82c59ba7189509d6b4' 
  AND token = 'Kc/zpT7ZkIeU5iG/wQ3oRXnMwatT3QexfD96wd6CmvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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