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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e8fdc70a08142c73f336ed436fff47389b3999a2e1a3b2eaaf6e623afd84be9' 
  AND token = 'FlLSAgfcpLLc/8+tesX8sSJ0r8rXcJuwXa5ly+5DWgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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