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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0410a468ff9b950383fde3ae82f597635e7825eff5550db96e3479caa4b6f58' 
  AND token = 'qNuXFocFTJLp/LmbXtxXAl47cbAvXCuVFoThQoCqnjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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