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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8602004e8c309e6cebd76d3baad80a3c04eb784aaf6b37cfef3c0d05ebf21847' 
  AND token = 'dxuPgdfEzuKIJcQsqCf7Kbj+cPunvbjPd16pIDN2aJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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