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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5abee5579912daa316b1eedb40fae5a9a2637a0f4ab1048a93aabea954c20ed' 
  AND token = 'ip1eTTIeZ7Kz0EIx9beEThmTlsj+DyC4mt/+HFxGHmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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