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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc84230fe8df40ef2995905fcda67dac0500609c06eb37a4f3d1446528967dc4' 
  AND token = '/yvGGNjm87wrHh29Ru/hyqJmX4k/MfX42c37H7NbcWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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