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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3d9fc5d1b2ac241dedce2d8577dda7ccae681fdb48227fe476159fb3f98218e' 
  AND token = 'd0EixUS3i3kIXAuLll0Eut44XhetfNe6tWUcM7sT1J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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