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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c1926d8ed0ee4fc3cba003cc8e343779bcfc73328955f419b4a8ae55e54b9b6' 
  AND token = '+7MMVu1/m4cS6DApAAm802JfpQ+LsBis9mTsIGxkOCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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