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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '614027bc92855b4f8267761da202d1470ed8bcc362d3337f6ab8f81415f39de5' 
  AND token = 'PNi8ceNkmaLNN9CuDKrWcmwyeoA8wEBTPNF3GTU1F3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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