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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d4c641f0a13e75a27474c16a31285cf7853ecb2f5214012e5126ff91fcacac3' 
  AND token = 'qGbC9TX0offGNleQw7s/Owh6Z73sdn/3jz+s/GlNKWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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