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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4aea618116065dfb474be08fc0b5295f84104ed37136f12472682b6880ae51a' 
  AND token = 'ajyxAiAJjn+NZy/pyeCJamDBSO6ZD+KPcVLllHZ+Nac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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