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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20077eed620f9089cbd83830e73ef943e2d9feba2f50dd367293fa0d99c3cc6e' 
  AND token = 'LFc+m3IXakwyF0EUBFa/Olwqzrau+6h7/7xthUpHu0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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