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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f61a7884b168d4f59e88ed7a8e5dcef1aaef36101a1776d3d53c4429d68cffbd' 
  AND token = 'MPf0bewfVDLRqpNZ1XqfMgNVDyC2+mdOXMzG/8ixtF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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