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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1863238026704562faf03fd03b61ae224871f232778c4ad0b47315dcaa4d4940' 
  AND token = 'akm+hN45LmxpTMcbBNUK1SoKBVLwnpenPDIMbWa23zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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