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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f71b94a1a7f0a6e8d82502e5e359983f1e8821b27b7a0c44188a57825f4b7a88' 
  AND token = 'ox+Sc91kGExoBOaRvoGdUUQSG6B3OaWBCb/FQm7jJmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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