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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '651cd343b83af0a4e29623b2efb1028938c07109c5329e28f143f0ce1714d946' 
  AND token = 't+X7K3St8drXPRyV9Y5C2g1E/Hln0hf+NoegV5Q01JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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