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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a7bdfdcd4b30bbf5c80bc341a49da3361c1bc6d5ead7bf08bbdbe21785662b3' 
  AND token = 'ofexLiF90WTe/IePEMiP7DOB8FkFsUs/xDV4zebKnBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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