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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b4701cf8f6ad4500df5f04dc4d077b7c4f5fe63d904aeb1c7356ddae5a87a49' 
  AND token = 'E/4wNGuAgHDtdxZ7Hz3Rq+K+ia6v3uDDDWM+afNfZgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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