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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6532eb0146be7db3fa785cf0d0fd201b2010d959dad363154dffa3be7a6e9fc' 
  AND token = '3R+4aOSluUUdUUQbao0PANGRA8QRkHBtd/M7zTy1uvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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