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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e864671440e56bb23a3d56fbf00d426a14ea9cac31b11bd6e7e23237af5457e' 
  AND token = 'TwTuk6k48sDm6y/65ssjy9EKMGlHwKLVkde/FWxsxvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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