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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b56f173ef59d4c9cdaf20cb00a7bc2da3ba6211af8c4dd0c66071709e03a92b' 
  AND token = '2j1I53H87zMbyYLMHzlXizcaWeEQwswPMcW9WRAksNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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