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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29cad6bf54fca336059bcd3e06a2de389135ad594f0bece7322c11cd58865c63' 
  AND token = '9hA/R2xzdUaoBYubo9gsYtyUYH4l04oimg3WU+HEA48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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