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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd922560c3c9ab89410827b705fd50caa7b706ff9af0345a5bae5e64e2add0708' 
  AND token = 'MSW3zQ1SFsxubO0XzmZqymOQbengI8ehfFCrb9x8kHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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