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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a19b9ad6b69dfbf1c04fa2d5863a688c5c6d2b43f797ddde3afe1f2b2e652e8c' 
  AND token = '1LAFbNLbUoq7SgcylwgFsgG84tIUwSa2bxkPwvYafN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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