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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2da4aa34b643abbe4f776755c75b91a2b094a28f1523f47fb0a93ef16f4f96d5' 
  AND token = 'q8CUFSACfFcEAsD3HP102gWxcZOqHMAhOhnRp4UzASQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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