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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0512efbb29b646754289bfd85ac2a4773575a6a62b8d3e661ce991298074d4bf' 
  AND token = 'UWaiHNkiK2FbEAIL3EiEEfvviN6PZ4mwJwSy9MBRW5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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