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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3f62c7413704c83993b15ee35fb89a233a4af6c61504928ec87b89e8a248523' 
  AND token = 'DvmsB3VzVHv0f999zgJetWI7bfLyZS8FOddWecZ33Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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