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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6aa64f7e0853f94ab336cf0c5b81094ce4f397ec1d26105e1c96d84d844b17a4' 
  AND token = 'QBfw5r4eFPPJuIKk3nUY2u3g+FSaYBdkpchyLnl18J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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