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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '343f294d87e30cb13f8c80d530eda231acbeaac9977a4d24a0bfd8d2099218ab' 
  AND token = 'pOshPCAQ26JyYFgpak4iTyYqdvkYCXzQkEyrQu+ScgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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