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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d758dffb7e5272f145e2d446cdede5bcad533634e831b57b9c623a0c1ec13ac' 
  AND token = 'OPtZ2ia/4RqRVKSt90dNOPlK56vScKAgl718ve9Pbt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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