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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '463c2a143de64f37018b5933d687ecb3dd05de42ac41b7b055b4554557839ed2' 
  AND token = 'Nx2mqhoxx2afiCDjZPHlgCwjOojeZuNyZ0ElqrALRcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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