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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '443be2d504984f2687f7bdde36b108b3a23ffeb66073e494b3ba24a8632d4b4a' 
  AND token = 'Glgv+kVI/vsb6Vwoc7zppRf5DHdzLW4Z8gznTb8+iNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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