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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '534ec3cb5076408484911c88d80bfc2d8e5cd275e7f608fb18f0e1cf8441aa00' 
  AND token = '1ZhNS69njy4zlehaxfNorKlB0gIVxPONLbSH4UzLebM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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