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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e2a815a6c0ceff00a23f133a876e8c109bb926d1fafd5b58b9edde0a2148009' 
  AND token = 'q6JL14Q7KKQXdevAwwnHfCAUwTNGH1oPdtjjoIpsxZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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