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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25b5183431644d0ec09039f2d51affe37a51474097acb2d8ef16f9c29579c9b1' 
  AND token = 'QppYmg9b23hZcRJ5axyMaIfAvwFA9fDm4fqm8XWngdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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