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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5013186e508bfb90331e2e2d693b93ee141f5632a667a7d30357e7c34ca5023' 
  AND token = 'dwts0CjbMV8XmI/EWyJC3Vrx22yL86M+p68ACnE0mwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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